Some links on the history of ProgPoW:

https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1057.md The EIP and commentary
https://github.com/ifdefelse/ProgPOW (read issues for some critiques and answers)
https://medium.com/@OhGodAGirl/the-problem-with-proof-of-work-da9f0512dad9
https://medium.com/@ifdefelse several posts
https://youtube.com/watch?v=pe1pDGDy6iE
https://reddit.com/r/ethereum/comments/9jq75n/progpow_algorithm_change_covered_in_todays_eth/ Mr Def answering Eth Devs questions
https://2miners.com/blog/ethereum-progpow-explained/
https://medium.com/@andrea.lanfranchi/what-gpu-miners-may-not-know-about-progpow-a9bb42a0d5a7
https://medium.com/@lookfirst/13-questions-about-ethereums-movement-to-progpow-e17e0a6d88b8
https://medium.com/@profheisenberg/everybody-knows-alus-are-relatively-tiny-circuits-a589d2de4cce this comment removed by linzhi
https://decrypt.co/6239/ethereum-mining-gpu-future-prospects-progpow-cudo-miner
https://swende.se/blog/Progpow.html
https://medium.com/altcoin-magazine/comprehensive-progpow-benchmark-715126798476 Some GPU testing
https://medium.com/@fubuloubu/skeptical-about-progpow-i-am-too-5211c88faf35
https://medium.com/ethereum-cat-herders/progpow-audits-released-ed4973ebe073 Audits
https://www.reddit.com/r/ethereum/comments/d847af/in_defense_of_progpow/
https://github.com/Souptacular/linzhi FUD

Current situation is that after passing audits it is eligible for inclusion again and the next fork is Berlin, currently scheduled June 2020.